Coordinated sidelink power savings configurations

ABSTRACT

Certain aspects of the present disclosure provide techniques for coordinated sidelink power savings configurations. A wireless node may select a sidelink power savings configuration to use for a sidelink between the wireless node and a user equipment (UE), provide the selected configuration to the UE, and follow the configuration for the sidelink. The selection may be based on input from the UE or without input from the UE. The selection may be a current power savings configuration at the wireless node, a power savings configuration suggest by the UE, or a different power savings configuration determined by the wireless node based on the current and suggested power savings configuration. When a new UE connects to the wireless node, the wireless node may reselect a power savings configuration to use for the sidelinks and provide the reselected power savings configuration to the UEs having a sidelink with the wireless node.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims benefit of and priority to U.S. Provisional Application No. 62/953,375, filed Dec. 24, 2019, which is hereby assigned to the assignee hereof and hereby expressly incorporated by reference herein in its entirety as if fully set forth below and for all applicable purposes.

BACKGROUND Field of the Disclosure

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for coordinated sidelink power savings configurations for devices with multiple sidelinks.

Description of Related Art

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access systems include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems, to name a few.

These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. New radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is a set of enhancements to the long term evolution (LTE) mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL). To these ends, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in NR and LTE technology. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

SUMMARY

The systems, methods, and devices of the disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. After considering this discussion, and particularly after reading the section entitled “Detailed Description” one will understand how the features of this disclosure provide advantages that include improved sidelink control information (SCI) transmission.

One or more aspects of the subject matter described in this disclosure can be implemented in a method for wireless communication by a wireless node. The method generally includes selecting a sidelink power savings configuration to use for a sidelink between the wireless node and a user equipment (UE). The method generally includes providing the selected sidelink power savings configuration to the UE. The method generally includes following the sidelink power savings configuration for the sidelink.

One or more aspects of the subject matter described in this disclosure can be implemented in a method for wireless communication by a UE. The method generally includes receiving, from a wireless node over a sidelink, a selected sidelink power savings configuration to use for the sidelink. The method generally includes following the selected sidelink power savings configuration for the sidelink.

One or more aspects of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus generally includes at least one processor and a memory coupled to the at least one processor. The memory generally includes code executable by the at least one processor to cause the apparatus to select a sidelink power savings configuration to use for a sidelink between the apparatus and a UE. The memory generally includes code executable by the at least one processor to cause the apparatus to provide the selected sidelink power savings configuration to the UE. The memory generally includes code executable by the at least one processor to cause the apparatus to follow the sidelink power savings configuration for the sidelink.

One or more aspects of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus generally includes at least one processor and a memory coupled to the at least one processor. The memory generally includes code executable by the at least one processor to cause the apparatus to receive, from a wireless node over a sidelink, a selected sidelink power savings configuration to use for the sidelink. The memory generally includes code executable by the at least one processor to cause the apparatus to follow the selected sidelink power savings configuration for the sidelink.

One or more aspects of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus generally includes means for selecting a sidelink power savings configuration to use for a sidelink between the apparatus and a UE. The apparatus generally includes means for providing the selected sidelink power savings configuration to the UE. The apparatus generally includes means for following the sidelink power savings configuration for the sidelink.

One or more aspects of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus generally includes means for receiving, from a wireless node over a sidelink, a selected sidelink power savings configuration to use for the sidelink. The apparatus generally includes means for following the selected sidelink power savings configuration for the sidelink.

One or more aspects of the subject matter described in this disclosure can be implemented in a computer readable medium storing computer executable code thereon for wireless communication. The computer executable code generally includes code for selecting a sidelink power savings configuration to use for a sidelink between a wireless node and a UE. The computer executable code generally includes code for providing the selected sidelink power savings configuration to the UE. The computer executable code generally includes code for following the sidelink power savings configuration for the sidelink.

One or more aspects of the subject matter described in this disclosure can be implemented in a computer readable medium storing computer executable code thereon for wireless communication. The computer executable code generally includes code for receiving, from a wireless node over a sidelink, a selected sidelink power savings configuration to use for the sidelink. The computer executable code generally includes code for following the selected sidelink power savings configuration for the sidelink.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the appended drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the manner in which the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the drawings. It is to be noted, however, that the appended drawings illustrate only certain aspects of this disclosure and the description may admit to other equally effective aspects.

FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.

FIG. 2 is a block diagram conceptually illustrating a design of an example a base station (BS) and user equipment (UE), in accordance with certain aspects of the present disclosure.

FIG. 3 is an example frame format for new radio (NR), in accordance with certain aspects of the present disclosure.

FIG. 4 shows diagrammatic representations of example vehicle to everything (V2X) systems, in accordance with certain aspects of the present disclosure.

FIG. 5 illustrates an example V2X communication system, in accordance with certain aspects of the present disclosure.

FIG. 6 is a diagram illustrating an example node with multiple sidelinks, in accordance with certain aspects of the present disclosure.

FIG. 7A is a diagram illustrating an example discontinuous reception (DRX) cycle, in accordance with certain aspects of the present disclosure.

FIG. 7B is a diagram illustrating example control channel reception during a DRX ON duration, in accordance with certain aspects of the present disclosure.

FIG. 8 is a diagram illustrating example long DRX and short DRX cycles, in accordance with certain aspects of the present disclosure.

FIG. 9 is a flow diagram illustrating example operations for wireless communication by a wireless node, in accordance with aspects of the present disclosure.

FIG. 10 is a flow diagram illustrating example operations for reselecting a sidelink power savings configuration by a wireless node, in accordance with aspects of the present disclosure.

FIG. 11 is a flow diagram illustrating example operations for wireless communication by a UE, in accordance with aspects of the present disclosure.

FIG. 12 illustrates an example communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.

FIG. 13 illustrates an example communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.

To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation.

DETAILED DESCRIPTION

Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for coordinated power savings configurations for a wireless node with multiple sidelinks.

Power saving techniques, such as a discontinuous reception (DRX) mode, may allow a wireless node, such as a user equipment (UE) to enter a low power mode for durations in which the UE does not transmit and/or receive and to exit the low power mode for durations in which the UE monitors for transmissions and/or sends transmissions. In some cases, a UE may communicate over an access link with a base station (BS) and also over one or more sidelinks with one or more other UEs. The UE may utilize separate power saving configurations for the access link and sidelink(s). A relay UE may be relay information from multiple sidelinks to a BS. Without coordination of the power saving configurations, the UE may not achieve power savings, due to the low power durations for the different configurations not being aligned/coordinated.

The techniques presented herein allow the wireless node having multiple sidelinks to coordinate power savings configurations for the sidelinks. In some examples, a relay-UE may determine the power savings configuration to be used for the sidelink. A remote-UE may provide input on a preferred power savings configuration.

The following description provides examples of coordinated sidelink power savings configurations. Changes may be made in the function and arrangement of elements discussed without departing from the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For instance, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Also, features described with respect to some examples may be combined in some other examples. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the disclosure is intended to cover such an apparatus or method that is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects.

In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, an air interface, etc. A frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, a subband, etc. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.

The techniques described herein may be used for various wireless networks and radio technologies me. For clarity, while aspects may be described herein using terminology commonly associated with 3G, 4G, and/or new radio (e.g., 5G NR) wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems including later technologies.

NR access may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth, millimeter wave (mmW) targeting high carrier frequency, massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low-latency communications (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements. In addition, these services may co-exist in the same subframe.

The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In 5G NR two initial operating bands have been identified as frequency range designations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz-300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.

With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band.

NR may also support beamforming and beam direction may be dynamically configured. Multiple-input multiple-output (MIMO) transmissions with precoding may also be supported. In some examples, MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. In some examples, multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.

FIG. 1 illustrates an example wireless communication network 100 in which aspects of the present disclosure may be performed. For example, the wireless communication network 100 may be an NR system (e.g., a 5G NR network). The core network 132 may be in communication with one or more base station (BSs) 110 a-z (each also individually referred to herein as BS 110 or collectively as BSs 110) and/or user equipment (UE) 120 a-y (each also individually referred to herein as UE 120 or collectively as UEs 120) in the wireless communication network 100 via one or more interfaces.

A BS 110 may provide communication coverage for a particular geographic area, sometimes referred to as a “cell”, which may be stationary or may move according to the location of a mobile BS 110. In some examples, the BSs 110 may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in wireless communication network 100 through various types of backhaul interfaces (e.g., a direct physical connection, a wireless connection, a virtual network, or the like) using any suitable transport network. In the example shown in FIG. 1 , the BSs 110 a, 110 b and 110 c may be macro BSs for the macro cells 102 a, 102 b and 102 c, respectively. The BS 110 x may be a pico BS for a pico cell 102 x. The BSs 110 y and 110 z may be femto BSs for the femto cells 102 y and 102 z, respectively. A BS may support one or multiple cells. UEs 120 (e.g., 120 x, 120 y, etc.) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile.

According to certain aspects, the UEs 120 may be configured for sidelink communications. As shown in FIG. 1 , the UE 120 a includes a power savings manager 122 a, the UE 120 b includes a power savings manager 122 b, and the BS 110 a includes a power savings manager 112 a. The power savings manager 122 a, the power savings manager 122 b, and/or the power savings manager 112 a may be configured for coordinated sidelink power savings configurations, in accordance with aspects of the present disclosure.

Wireless communication network 100 may also include relay stations (e.g., relay station 110 r), also referred to as relays or the like, that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110 a or a UE 120 r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110), or that relays transmissions between UEs 120, to facilitate communication between devices.

A network controller 130 may couple to a set of BSs 110 and provide coordination and control for these BSs 110. The network controller 130 may communicate with the BSs 110 via a backhaul. The network controller 130 may be in communication with the core network 132 (e.g., a 5G Core Network (5GC)), which provides various network functions such as Access and Mobility Management, Session Management, User Plane Function, Policy Control Function, Authentication Server Function, Unified Data Management, Application Function, Network Exposure Function, Network Repository Function, Network Slice Selection Function, etc.

FIG. 2 illustrates example components of BS 110 a and UE 120 a (e.g., in the wireless communication network 100 of FIG. 1 , which may be similar components in the UE 120 b), which may be used to implement aspects of the present disclosure.

At the BS 110 a, a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240. The control information may be for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid ARQ indicator channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), etc. The data may be for the physical downlink shared channel (PDSCH), etc. A medium access control (MAC)-control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes. For example, a BS may transmit a MAC CE to a UE to put the UE into a discontinuous reception (DRX) mode to reduce the UE's power consumption. The MAC-CE may be carried in a shared channel such as a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical sidelink shared channel. A MAC-CE may also be used to communicate information that facilitates communication, such as information regarding buffer status and available power headroom.

The processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), and channel state information reference signal (CSI-RS). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) in transceivers 232 a-232 t. Each modulator may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink (DL) signal. DL signals from modulators in transceivers 232 a-232 t may be transmitted via the antennas 234 a-234 t, respectively.

At the UE 120 a, the antennas 252 a-252 r may receive the downlink signals from the BS 110 a, or sidelink signals from the UE 120 b, and may provide received signals to the demodulators (DEMODs) in transceivers 254 a-254 r, respectively. Each demodulator may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all the demodulators in transceivers 254 a-254 r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 a to a data sink 260, and provide decoded control information to a controller/processor 280.

On the uplink (UL) and/or sidelink, at UE 120 a, a transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH)) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor 280. The transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators in transceivers 254 a-254 r (e.g., for SC-FDM, etc.), and transmitted to the BS 110 a. At the BS 110 a, the UL signals from the UE 120 a may be received by the antennas 234, processed by the demodulators in transceivers 232 a-232 t, detected by a MMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120 a. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.

The memories 242 and 282 may store data and program codes for BS 110 a and UE 120 a, respectively. A scheduler 244 may schedule UEs for data transmission on the DL and/or UL.

Antennas 252, processors 266, 258, 264, and/or controller/processor 280 of the UE 120 a and/or antennas 234, processors 220, 230, 238 may be used to perform the various techniques and methods described herein. For example, as shown in FIG. 2 , the controller/processor 280 of the UE 120 a has a power saving manager 281 and the controller/processor 240 of the BS 110 a has a power saving manager 241. The power saving manager 281 and/or the power saving manager 241 may be configured for coordinated sidelink power savings configurations for multiple sidelinks.

NR may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink. NR may support half-duplex operation using time division duplexing (TDD). OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers may be fixed, and the total number of subcarriers may be dependent on the system bandwidth. The minimum resource allocation, called a resource block (RB), may be 12 consecutive subcarriers. The system bandwidth may also be partitioned into subbands. For example, a subband may cover multiple RBs. NR may support a base subcarrier spacing (SCS) of 15 KHz and other SCS may be defined with respect to the base SCS (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.).

FIG. 3 is a diagram showing an example of a frame format 300 for NR. The transmission timeline for each of the DL and UL may be partitioned into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9. Each subframe may include a variable number of slots (e.g., 1, 2, 4, 8, 16, . . . slots) depending on the SCS. Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols) depending on the SCS. The symbol periods in each slot may be assigned indices. A mini-slot, which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols). Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched. The link directions may be based on the slot format. Each slot may include DL/UL data as well as DL/UL control information.

In NR, a synchronization signal block (SSB) is transmitted. In certain aspects, SSBs may be transmitted in a burst where each SSB in the burst corresponds to a different beam direction for UE-side beam management (e.g., including beam selection and/or beam refinement). The SSB includes a PSS, a SSS, and a two symbol PBCH. The SSB can be transmitted in a fixed slot location, such as the symbols 0-3 as shown in FIG. 3 . The PSS and SSS may be used by UEs for cell search and acquisition. The PSS may provide half-frame timing, the SS may provide the CP length and frame timing. The PSS and SSS may provide the cell identity. The PBCH carries some basic system information, such as downlink system bandwidth, timing information within radio frame, SS burst set periodicity, system frame number, etc. The SSBs may be organized into SS bursts to support beam sweeping. Further system information such as, remaining minimum system information (RMSI), system information blocks (SIBs), other system information (OSI) can be transmitted on a physical downlink shared channel (PDSCH) in certain subframes. The SSB can be transmitted up to sixty-four times, for example, with up to sixty-four different beam directions for mmWave. The multiple transmissions of the SSB are referred to as a SS burst set. SSBs in an SS burst set may be transmitted in the same frequency region, while SSBs in different SS bursts sets can be transmitted at different frequency regions.

In some examples, access to the air interface may be scheduled. A scheduling entity (e.g., a BS 110) allocates resources for communication among some or all devices and equipment within its service area or cell. The scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity. BSs 110 are not the only entities that may function as a scheduling entity. In some examples, a UE 120 may function as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs 120), and the other UEs 120 may utilize the resources scheduled by the UE 120 for wireless communication. In some examples, a UE 120 may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network. In a mesh network example, UEs 120 may communicate directly with one another in addition to communicating with a scheduling entity.

In some examples, the communication between the UEs 120 and BSs 110 is referred to as the access link. The access link may be provided via a Uu interface. Communication between devices may be referred as the sidelink.

In some examples, two or more subordinate entities (e.g., UEs 120) may communicate with each other using sidelink signals. Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh, and/or various other suitable applications. Generally, a sidelink signal may refer to a signal communicated from one subordinate entity (e.g., UE 120 a) to another subordinate entity (e.g., another UE 120) without relaying that communication through the scheduling entity (e.g., UE 120 or BS 110), even though the scheduling entity may be utilized for scheduling and/or control purposes. In some examples, the sidelink signals may be communicated using a licensed spectrum (unlike wireless local area networks, which may use an unlicensed spectrum). One example of sidelink communication is PC5, for example, as used in V2V, LTE, and/or NR.

Various sidelink channels may be used for sidelink communications, including a physical sidelink discovery channel (PSDCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH). The PSDCH may carry discovery expressions that enable proximal devices to discover each other. The PSCCH may carry control signaling such as sidelink resource configurations and other parameters used for data transmissions, and the PSSCH may carry the data transmissions. The PSFCH may carry feedback such as CSI related to a sidelink channel quality.

Roadside units (RSUs) may be utilized. An RSU may be used for V2I communications. In some examples, an RSU may act as a forwarding node to extend coverage for a UE. In some examples, an RSU may be co-located with a BS or may be standalone. RSUs can have different classifications. For example, RSUs can be classified into UE-type RSUs and Micro NodeB-type RSUs. Micro NB-type RSUs have similar functionality as the Macro eNB/gNB. The Micro NB-type RSUs can utilize the Uu interface. UE-type RSUs can be used for meeting tight quality-of-service (QoS) requirements by minimizing collisions and improving reliability. UE-type RSUs may use centralized resource allocation mechanisms to allow for efficient resource utilization. Critical information (e.g., such as traffic conditions, weather conditions, congestion statistics, sensor data, etc.) can be broadcast to UEs in the coverage area. Relays can re-broadcasts critical information received from some UEs. UE-type RSUs may be a reliable synchronization source.

FIG. 4 and FIG. 5 show diagrammatic representations of example V2X systems, in accordance with some aspects of the present disclosure. For example, the vehicles shown in FIG. 4 and FIG. 5 may communicate via sidelink channels and may perform sidelink CSI reporting as described herein.

The V2X systems, provided in FIG. 4 and FIG. 5 provide two complementary transmission modes. A first transmission mode, shown by way of example in FIG. 4 , involves direct communications (for example, also referred to as side link communications) between participants in proximity to one another in a local area. A second transmission mode, shown by way of example in FIG. 5 , involves network communications through a network, which may be implemented over a Uu interface (for example, a wireless communication interface between a radio access network (RAN) and a UE).

Referring to FIG. 4 , a V2X system 400 (for example, including vehicle to vehicle (V2V) communications) is illustrated with two vehicles 402, 404. The first transmission mode allows for direct communication between different participants in a given geographic location. As illustrated, a vehicle can have a wireless communication link 406 with an individual (V2P) (for example, via a UE) through a PC5 interface. Communications between the vehicles 402 and 404 may also occur through a PC5 interface 408. In a like manner, communication may occur from a vehicle 402 to other highway components (for example, highway component 410), such as a traffic signal or sign (V2I) through a PC5 interface 412. With respect to each communication link illustrated in FIG. 4 , two-way communication may take place between elements, therefore each element may be a transmitter and a receiver of information. The V2X system 400 may be a self-managed system implemented without assistance from a network entity. A self-managed system may enable improved spectral efficiency, reduced cost, and increased reliability as network service interruptions do not occur during handover operations for moving vehicles. The V2X system may be configured to operate in a licensed or unlicensed spectrum, thus any vehicle with an equipped system may access a common frequency and share information. Such harmonized/common spectrum operations allow for safe and reliable operation.

FIG. 5 shows a V2X system 500 for communication between a vehicle 552 and a vehicle 554 through a network entity 556. These network communications may occur through discrete nodes, such as a BS, that sends and receives information to and from (for example, relays information between) vehicles 552, 554. The network communications through vehicle to network (V2N) links 558 and 510 may be used, for example, for long range communications between vehicles, such as for communicating the presence of a car accident a distance ahead along a road or highway. Other types of communications may be sent by the wireless node to vehicles, such as traffic flow conditions, road hazard warnings, environmental/weather reports, and service station availability, among other examples. Such data can be obtained from cloud-based sharing services.

As mentioned above, aspects of the present disclosure relate sidelink power savings configurations for a wireless node with multiple sidelinks.

FIG. 6 is a diagram illustrating an example wireless node with access link and multiple sidelinks, in accordance with certain aspects of the present disclosure. As shown in FIG. 6 , a wireless node 604 may have an access link 603 (e.g., via the Uu interface) with a BS 602. The BS 602 may be a gNB. In some examples, the wireless node 604 is a UE. The wireless node 604 may be referred to as a relay UE. In some examples, the wireless node 604 and BS 602 are in a 5G NR wireless communication network. As shown in FIG. 6 , the wireless node 604 also has multiple sidelinks 605, 607, 609 (e.g., via the PC5 interface(s)) with the UEs 606, 608, and 610. The wireless node 604 may forward transmissions from the UEs 606, 608, and/or 610 to the BS 602. The UEs 606, 608, and 610 may be out of coverage of the BS 602. The UEs 606, 608, and 610 may not have a direct connection or access link to the BS 602. The UEs 606, 608, and 610 may be referred to as remote UEs. Thus, the wireless node 604 may receive transmissions from the BS 602 over the access link 603 and from the UEs 606, 608, and/or 610 over multiple sidelinks 605, 607, 609.

Power savings configurations may be configured for the sidelink(s). A wireless device may include baseband processing components, radio frequency (RF) RX front end components (e.g., referred to as a receive (RX) chain), and RF TX front end components (e.g., referred to as a transmit (TX) chains). A power savings configuration may allow the wireless device to power off one or more of these RF components when not in use in order to save power. In some examples, a power savings configuration may use a wake-up signal. In some examples, a power savings configuration may use discontinuous reception (DRX) cycles.

When DRX is configured for a sidelink, the wireless device cycles through ON periods (e.g., ON durations) and OFF periods (e.g., OFF durations) to save power. When the wireless device is in the DRX OFF state, the wireless device stops monitoring transmissions (e.g., PSCCH on the sidelink) and, therefore, does not process any sidelink data.

FIGS. 7A and 7B are diagrams illustrating example DRX cycles, in accordance with certain aspects of the present disclosure. As shown in FIGS. 7A and 7B, a DRX cycle 704 may include an ON duration 702 and an OFF duration 706. As shown in FIG. 7B, when a PSCCH is received in an ON duration 708, the wireless device may start a DRX inactivity timer that indicates a duration 710 the wireless device should remain ON and monitor for transmissions. If another transmission is received, the wireless device may restart the DRX inactivity timer. Once the timer expires, the wireless device may go to sleep.

FIG. 8 is a diagram illustrating example configured long and short DRX cycles, in accordance with certain aspects of the present disclosure. As shown in FIG. 8 , the long DRX cycle may include longer ON durations and OFF durations than the short DRX cycle.

Availability and knowledge of traffic information (e.g., traffic types and quality-of-service (QoS) requirements) are used to choose the DRX configuration. Thus, for a BS-UE link (e.g., the Uu interface), the DRX configuration may be chosen by the BS based on the type of traffic that the BS intends to send to the UE (and may further be based on scheduler preferences).

For the wireless node to remote-UE link (e.g., the PC5 interface), if sidelink power savings configurations are independently configured for the multiple sidelink(s) (e.g., in an uncoordinated manner), then the wake ups for the wireless node with multiple sidelinks may be inefficient (and/or incompatible). Further, the sidelink UEs (e.g., remote UEs) may be out of coverage and not under direct control of the BS. Thus, the wireless node may know very little about those remote UEs. For example, the wireless node may not be aware of the traffic patterns, scheduling, etc., of those remote UEs. Therefore, the power savings configurations for the multiple sidelinks may be uncoordinated and may not be efficient.

With uncoordinated power savings configurations, the wireless node may realize little power savings and few or no long sleep cycles. Further, powering on and powering off RF components may require a power-on and power-off time to fully turn on or off. Therefore, toggling frequently between powered-on and powered-off may be inefficient.

Further, the remote UE may not choose the sidelink power savings configuration because this may violate an implicit hierarchy between the BS, wireless node, and remote UE.

Accordingly, aspects of the present disclosure provide for coordinated sidelink power savings configurations where a wireless node determines multiple sidelink power savings configuration.

Example Coordinated Sidelink Power Savings Configurations

According to certain aspects, a wireless node, such as a relay user equipment (UE) with multiple sidelinks for multiple remote UEs, may decide power savings configurations to be used for the multiple sidelinks and/or for the access link. In some examples, remote UEs may further provide information that may be used by the wireless node for determining the sidelink power savings configurations. The information may also be used for determining the access link power savings configuration. In some examples, the wireless node may determine the sidelink power savings configuration without input from the remote UEs. In some examples, the wireless node may determine the sidelink power savings configuration with sidelink traffic information or a proposed (e.g., suggested or preferred) power savings configuration from the remote UEs. In some examples, the power savings configuration may be a discontinuous reception (DRX) cycle configuration, a wake-up signal configuration, or other power savings configuration. The sidelink power savings configuration may define periods that the wireless node monitors one or more physical sidelink control channels (PSCCH) for transmissions from the remote UEs.

According to certain aspects, the wireless node may select the sidelink power savings configuration to use for a sidelink with a remote UE without input from the remote UE. The wireless node may send an explicit indication to the remote UE that the wireless node is not open to input from the remote UE. The wireless node may provide the selected sidelink power savings configuration to the remote UE and follow the sidelink power savings configuration without receiving any input from the remote UE and/or ignoring any input received from the remote UE. In some examples, the wireless node may select its current sidelink power savings configuration. In some examples, the wireless node may send the selected sidelink power savings configuration to all remote UEs with which the wireless node has a sidelink. In some examples, the current sidelink power savings configuration may be a default sidelink power savings configuration (e.g., configured by a base station (BS)). In some examples, the current sidelink power savings configuration is a sidelink power savings configuration previously determined for another remote UE.

According to certain aspects, the wireless node may select the sidelink power savings configuration to use for a sidelink with a remote UE based on input from the remote UE. In some examples, the wireless node may receive information from the remote UE and select the sidelink power savings configuration based on the information.

In some examples, the information received from the remote UE may be a suggested (e.g., proposed, preferred, or requested) sidelink power savings configuration from the remote UE. In this case, the wireless node may select its current/default sidelink power savings configuration to use for the sidelink, the wireless node may select the suggested sidelink power savings configuration to use for the sidelink, or the wireless node may determine a new (e.g., or adjusted) sidelink power savings configuration to use for the sidelink.

In some examples, the information received from the remote UE may include sidelink traffic information associated with the remote UE. For example, the information may include traffic patterns, target quality-of-service (QoS) parameters for the sidelink, traffic statistics, or other information that the wireless node may use to select and/or determine a sidelink power savings configuration to use for the sidelink.

In an illustrative example, a wireless node may send its current/default sidelink-DRX (SL-DRX) configuration (SL-DRX-config-1) to a remote UE. The remote-UE may receive the DRX configuration (SL-DRX-config-1) from the wireless node and, in turn, may suggest a DRX configuration for the sidelink (SL-DRX-config-2) to the wireless node. The wireless node may determine how to use the suggested DRX configuration from the remote UE. In some examples, the wireless node may adopt the suggested DRX configuration (SL-DRX-config-2). In some examples, the wireless node may determine a new DRX configuration (SL-DRX-config-3) based on the SL-DRX-config-1 and the SL-DRX-config-2 (e.g., by the SL-DRX-config-1 and the SL-DRX-config-2) and select the new SL-DRX-config-3. In some examples, the wireless node may choose to ignore the SL-DRX-Config-2 and select the SL-DRX-config-1.

The wireless node may inform the remote UE of the selected sidelink power savings configuration. Accordingly, the remote UE may ensure its own transmissions to the wireless node are based on the configuration chosen by the wireless node.

In some examples, the wireless node may inform all of the remote UEs, to which the wireless node has a sidelink, of the selected power savings configuration. In this case, the selected sidelink power savings configuration may become the current sidelink power savings configuration, and the process may repeat for another remote UE. Thus, the wireless node may determine sidelink power savings configurations for each of the remote UEs, and the configurations for the multiple sidelinks may be coordinated.

According to certain aspects, the wireless node may select a sidelink power savings configuration for all remote UEs having a sidelink with the wireless node. In some examples, the wireless node may reselect the sidelink power savings configuration each time a UE connects to the wireless node. The wireless node may provide the reselected sidelink power savings configuration, which may be the same as the current sidelink power savings configuration or may be a new or adjusted sidelink power savings configuration, to all of the UEs having a sidelink with the wireless node. The wireless node may monitor PSCCH from the remote UEs using the reselected (i.e., the most recent) sidelink power savings configuration. The remote UEs may transmit in accordance with the reselected sidelink power savings configuration.

In an illustrative example, a wireless node may have a sidelink with a first remote UE, and the wireless node and the first remote UE may follow a first SL-DRX configuration having a first duty cycle. When a second remote UE establishes a sidelink with the wireless node, the wireless node may reselect a SL-DRX configuration to be used. For example, the wireless node may forward the current (e.g., first) SL-DRX to the second remote UE and receive a suggested SL-DRX configuration from the second remote UE. For example, the second remote UE may suggest a SL-DRX configuration with a second duty cycle with more monitoring periods than the first SL-DRX configuration to accommodate the second remote UE. The wireless node may ignore the suggested SL-DRX configuration, adopt the suggested SL-DRX configuration, or determine a new SL-DRX based on the current and suggested SL-DRX configurations. The wireless node may then provide the final reselected SL-DRX configuration to the remote UEs. This operation may be performed each time a new remote UE establishes a sidelink with the wireless node.

Beyond scenarios where a new remote UE connects with the wireless node, reselection, by the wireless node, of the sidelink power savings mode may also occur in other scenarios. For example, the wireless may reselect the sidelink power savings configuration when the wireless node is plugged into a power source.

FIG. 9 is a flow diagram illustrating example operations 900 for wireless communication, in accordance with certain aspects of the present disclosure. The operations 900 may be performed, for example, by a wireless node (e.g., such as a UE 120 a in the wireless communication network 100). Operations 900 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 280 of FIG. 2 ). Further, the transmission and reception of signals by the wireless node in operations 900 may be enabled, for example, by one or more antennas (e.g., antennas 252 of FIG. 2 ). In certain aspects, the transmission and/or reception of signals by the wireless node may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.

Operations 900 may begin, at block 905, by a wireless node (e.g., a UE with an access link with a BS) selecting a sidelink power savings configuration to use for a sidelink between the wireless node and a UE (e.g., a remote UE). The wireless node may be a relay UE. The relay UE may have an access link with a BS and multiple sidelinks with multiple remote UEs. The sidelink power savings configuration may be a DRX cycle configuration defining one or more periods for the wireless node to monitor PSCCH.

According to certain aspects, the wireless node may provide an indication to the UE that the wireless node does not accept input from the UE for sidelink power savings configuration selection. The wireless node selects the sidelink power savings configuration without receiving input from the UE or ignores input from the UE.

According to certain aspects, the wireless node may receive sidelink information from the UE and select the sidelink power savings configuration based, at least in part, on the sidelink information from the UE. The sidelink information from the UE may include a suggested sidelink power savings configuration. For example, the wireless node may send an initial sidelink power savings configuration to the UE, and the suggested sidelink power savings configuration, received by the wireless node from the UE, may be based at least in part on the initial power savings configuration for the sidelink.

In some examples, the wireless node may select the initial sidelink power savings configuration. In some examples, the wireless node may select the suggested sidelink power savings configuration. In some examples, the wireless node may select a different sidelink power savings configuration, the different sidelink power savings configuration may be based on the initial sidelink power savings configuration and the suggested sidelink power savings configuration. In some examples, the initial sidelink power savings configuration may be a configured default sidelink power savings configuration or a current power savings configuration previously selected for another UE.

In some examples, the sidelink information may include traffic statistics, traffic patterns, QoS targets, a subset of parameters for a sidelink power savings configuration, sidelink scheduling information for the UE, or a combination thereof, associated with the UE.

At block 910, the wireless node provides the selected sidelink power savings configuration to the UE. According to certain aspects, the wireless node may have a plurality of sidelinks with a plurality of UEs, and the selected power savings configuration may be provided to each of the plurality of UEs.

At block 915, the wireless node follows the sidelink power savings configuration for the sidelink.

According to certain aspects, the wireless node may reselect a sidelink power savings configuration to use for sidelinks between the wireless node and the plurality of UEs, such as when a sidelink is established with a new UE, as shown in FIG. 10 at block 1005. At block 1010, the wireless node provides the reselected sidelink power savings configuration to the plurality of UEs and the new UE. At block 1015, the wireless node follows the reselected sidelink power savings configuration for the sidelinks between the plurality of UEs and the new UE. In some examples, the wireless node receives a plurality of sidelink power savings configurations for the plurality of UEs, and selects the sidelink power savings configuration based on the plurality of sidelink power savings configurations.

FIG. 11 is a flow diagram illustrating example operations 1100 for wireless communication, in accordance with certain aspects of the present disclosure. The operations 1100 may be performed, for example, by a remote UE (e.g., such as a UE 120 a in the wireless communication network 100). Operations 1100 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 280 of FIG. 2 ). Further, the transmission and reception of signals by the remote UE in operations 1100 may be enabled, for example, by one or more antennas (e.g., antennas 252 of FIG. 2 ). In certain aspects, the transmission and/or reception of signals by the remote UE may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.

Operations 1100 may begin, at 1110, by a UE receiving, from a wireless node over a sidelink, a selected sidelink power savings configuration to use for the sidelink.

In some examples, operations 1100 may begin, at block 1105, by a UE sending, to a wireless node over a sidelink, sidelink information. In this case, the sidelink power savings configuration received from the wireless node may be based, at least in part, on the sidelink information from the UE.

At block 1110, the UE receives, from the wireless node over the sidelink, a selected power savings configuration to use for the sidelink.

At block 1115, the UE follows the selected sidelink power savings configuration for the sidelink.

In some examples, optionally at block 1120, the UE receives, from the wireless node over the sidelink, a reselected sidelink power savings configuration to use for the sidelink.

According to certain aspects, the UE may receive an indication from the wireless node that the wireless node does not accept input from the UE for sidelink power savings configuration selection. In this case, the UE may refrain from sending input to the wireless node for the power savings configuration selection.

In some examples, the sidelink information sent to the wireless node may include a suggested sidelink power savings configuration. For example, the UE may receive an initial sidelink power savings configuration from the wireless node and determine the suggested sidelink power savings configuration based, at least in part, on the initial power savings configuration for the sidelink.

In some examples, the selected sidelink power savings configuration may be the initial sidelink power savings configuration, the suggested sidelink power savings configuration, or a different sidelink power savings configuration. The different sidelink power savings configuration may be based on the initial sidelink power savings configuration and the suggested sidelink power savings configuration.

In some examples, the sidelink information may include traffic statistics, traffic patterns, QoS targets, a subset of parameters for a sidelink power savings configuration, sidelink scheduling information for the UE, or a combination thereof, associated with the UE.

In some examples, the selected sidelink power savings configuration may be a DRX cycle configuration defining one or more periods for the wireless node to monitor PSCCH. The UE may follow the selected sidelink power savings configuration by transmitting PSCCH to the wireless node during the defined one or more periods.

FIG. 12 illustrates a communications device 1200 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIGS. 9 and 10 . The communications device 1200 includes a processing system 1202 coupled to a transceiver 1208 (e.g., a transmitter and/or a receiver). The transceiver 1208 is configured to transmit and receive signals for the communications device 1200 via an antenna 1210, such as the various signals as described herein. The processing system 1202 may be configured to perform processing functions for the communications device 1200, including processing signals received and/or to be transmitted by the communications device 1200.

The processing system 1202 includes a processor 1204 coupled to a computer-readable medium/memory 1212 via a bus 1206. In certain aspects, the computer-readable medium/memory 1212 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 1204, cause the processor 1204 to perform the operations illustrated in FIGS. 9 and 10 , or other operations for performing the various techniques discussed herein for coordinated sidelink power savings configurations. In certain aspects, computer-readable medium/memory 1212 stores code 1214 for selecting or reselecting (e.g., for selecting a sidelink power savings configuration to use for a sidelink between the wireless node and a UE or for reselecting a sidelink power savings configuration to use for sidelinks between the wireless node and the plurality of UEs and the new UE); code 1216 for providing (e.g., for providing the selected sidelink power savings configuration to the UE or for providing the reselected sidelink power savings configuration to the plurality of UEs and the new UE); and code 1218 for following (e.g., for following the sidelink power savings configuration for the sidelink or for following the reselected sidelink power savings configuration for the sidelinks between the plurality of UEs and the new UE). In certain aspects, the processor 1204 has circuitry configured to implement the code stored in the computer-readable medium/memory 1212. The processor 1204 includes circuitry 1224 for selecting or reselecting (e.g., for selecting a sidelink power savings configuration to use for a sidelink between the wireless node and a UE or for reselecting a sidelink power savings configuration to use for sidelinks between the wireless node and the plurality of UEs and the new UE); circuitry 1226 for providing (e.g., for providing the selected sidelink power savings configuration to the UE or for providing the reselected sidelink power savings configuration to the plurality of UEs and the new UE); and circuitry 1228 for following (e.g., for following the sidelink power savings configuration for the sidelink or for following the reselected sidelink power savings configuration for the sidelinks between the plurality of UEs and the new UE).

FIG. 13 illustrates a communications device 1300 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIG. 11 . The communications device 1300 includes a processing system 1302 coupled to a transceiver 1308 (e.g., a transmitter and/or a receiver). The transceiver 1308 is configured to transmit and receive signals for the communications device 1300 via an antenna 1310, such as the various signals as described herein. The processing system 1302 may be configured to perform processing functions for the communications device 1300, including processing signals received and/or to be transmitted by the communications device 1300.

The processing system 1302 includes a processor 1304 coupled to a computer-readable medium/memory 1312 via a bus 1306. In certain aspects, the computer-readable medium/memory 1312 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 1304, cause the processor 1304 to perform the operations illustrated in FIG. 11 , or other operations for performing the various techniques discussed herein for coordinated sidelink power savings configurations. In certain aspects, computer-readable medium/memory 1312 stores code 1314 for sending (e.g., for sending to a wireless node over a sidelink, sidelink information); code 1316 for receiving (e.g., for receiving, from a wireless node over a sidelink, a selected sidelink power savings configuration to use for the sidelink); code 1318 for following (e.g., for following the selected sidelink power savings configuration for the sidelink); and code 1320 for receiving (e.g., for receiving, from the wireless node over the sidelink, a reselected sidelink power savings configuration to use for the sidelink). In certain aspects, the processor 1304 has circuitry configured to implement the code stored in the computer-readable medium/memory 1312. The processor 1304 includes circuitry 1324 for sending (e.g., for sending to a wireless node over a sidelink, sidelink information); circuitry 1326 for receiving (e.g., for receiving, from a wireless node over a sidelink, a selected sidelink power savings configuration to use for the sidelink); circuitry 1328 for following (e.g., for following the selected sidelink power savings configuration for the sidelink); and circuitry 1330 for receiving (e.g., for receiving, from the wireless node over the sidelink, a reselected sidelink power savings configuration to use for the sidelink).

Example Aspects

Aspect 1: A method for wireless communication by a wireless node, comprising: selecting a sidelink power savings configuration to use for a sidelink between the wireless node and a user equipment (UE); providing the selected sidelink power savings configuration to the UE; and following the sidelink power savings configuration for the sidelink.

Aspect 2: The method of Aspect 1, further comprising providing an indication to the UE that the wireless node does not accept input from the UE for sidelink power savings configuration selection.

Aspect 3: The method of Aspect 1 or 2, further comprising: receiving sidelink information from the UE; and selecting the sidelink power savings configuration based, at least in part, on the sidelink information from the UE.

Aspect 4: The method of Aspect 3, wherein the sidelink information from the UE comprises a suggested sidelink power savings configuration.

Aspect 5: The method of Aspect 4, further comprising: sending, by the wireless node, an initial sidelink power savings configuration to the UE, wherein the suggested sidelink power savings configuration received by the wireless node from the UE is based, at least in part, on the initial power savings configuration for the sidelink.

Aspect 6: The method of Aspect 5, wherein selecting the sidelink power savings configuration to use for the sidelink comprises selecting the initial sidelink power savings configuration.

Aspect 7: The method of Aspect 5 or 6, wherein selecting the sidelink power savings configuration to use for the sidelink comprises selecting the suggested sidelink power savings configuration.

Aspect 8: The method of any of Aspects 5-7, wherein selecting the sidelink power savings configuration to use for the sidelink comprises selecting a different sidelink power savings configuration, the different sidelink power savings configuration being based on the initial sidelink power savings configuration and the suggested sidelink power savings configuration.

Aspect 9: The method of any of Aspects 5-8, wherein the initial sidelink power savings configuration comprises a configured default sidelink power savings configuration.

Aspect 10: The method of any of Aspects 5-9, wherein the initial sidelink power savings configuration comprises a current power savings configuration previously selected for another UE.

Aspect 11: The method of any of Aspects 3-10, wherein the sidelink information comprises traffic statistics, traffic patterns, quality-of-service (QoS) targets, a subset of parameters for a sidelink power savings configuration, sidelink scheduling information for the UE, or a combination thereof, associated with the UE.

Aspect 12: The method of any of Aspects 1-11, wherein: the wireless node has a plurality of sidelinks with a plurality of UEs; and the selected power savings configuration is provided to each of the plurality of UEs.

Aspect 13: The method of Aspect 12, further comprising, when another UE connects to the wireless node for sidelink communications: reselecting a sidelink power savings configuration to use for sidelinks between the wireless node and the plurality of UEs and the other UE; providing the reselected sidelink power savings configuration to the plurality of UEs and the other UE; and following the reselected sidelink power savings configuration for the sidelinks between the plurality of UEs and the other UE.

Aspect 14: The method of Aspect 12 or 13, wherein: the wireless node receives a plurality of sidelink power savings configurations for the plurality of UEs; and selecting the sidelink power savings configuration is further based on the plurality of sidelink power savings configurations.

Aspect 15: The method of any of Aspects 1-14, wherein the sidelink power savings configuration is a discontinuous reception (DRX) cycle configuration, the DRX cycle configuration defining one or more periods for the wireless node to monitor a physical sidelink control channel (PSCCH).

Aspect 16: A method for wireless communication by a user equipment (UE), comprising: receiving, from a wireless node over a sidelink, a selected sidelink power savings configuration to use for the sidelink; and following the selected sidelink power savings configuration for the sidelink.

Aspect 17: The method of Aspect 16, further comprising receiving an indication from the wireless node that the wireless node does not accept input from the UE for sidelink power savings configuration selection.

Aspect 18: The method of Aspect 16 or 17, further comprising: sending, to the wireless node over the sidelink, sidelink information, wherein the sidelink power savings configuration received from the wireless node is based, at least in part, on the sidelink information from the UE.

Aspect 19: The method of Aspect 18, wherein the sidelink information sent to the wireless node comprises a suggested sidelink power savings configuration.

Aspect 20: The method of Aspect 19, further comprising: receiving an initial sidelink power savings configuration from the wireless node; and determining the suggested sidelink power savings configuration based at least in part on the initial power savings configuration for the sidelink.

Aspect 21: The method of Aspect 20, wherein the selected sidelink power savings configuration from the wireless node comprises the initial sidelink power savings configuration.

Aspect 22: The method of Aspect 20 or 21, wherein the selected sidelink power savings configuration from the wireless node comprises the suggested sidelink power savings configuration.

Aspect 23: The method of any of Aspects 20-22, wherein the selected sidelink power savings configuration from the wireless node comprises a different sidelink power savings configuration, the different sidelink power savings configuration being based on the initial sidelink power savings configuration and the suggested sidelink power savings configuration.

Aspect 24: The method of any of Aspects 18-23, wherein the sidelink information comprises traffic statistics, traffic patterns, quality-of-service (QoS) targets, a subset of parameters for a sidelink power savings configuration, sidelink scheduling information for the UE, or a combination thereof, associated with the UE.

Aspect 25: The method of any of Aspects 16-24, further comprising: receiving, from the wireless node over the sidelink, a reselected sidelink power savings configuration to use for the sidelink.

Aspect 26: The method of any of Aspects 16-25, wherein: the selected sidelink power savings configuration is a discontinuous reception (DRX) cycle configuration, the DRX cycle configuration defining one or more periods for the wireless node to monitor a physical sidelink control channel (PSCCH); and following the selected sidelink power savings configuration comprises transmitting PSCCH to the wireless node during the one or more periods.

Aspect 27: An apparatus for wireless communication, comprising: means for selecting a sidelink power savings configuration to use for a sidelink between the apparatus and a user equipment (UE); means for providing the selected sidelink power savings configuration to the UE; and means for following the sidelink power savings configuration for the sidelink.

Aspect 28: The apparatus of Aspect 27, wherein: the apparatus has a plurality of sidelinks with a plurality of UEs; and the selected power savings configuration is provided to each of the plurality of UEs.

Aspect 29: The apparatus of Aspect 28, further comprising when another UE connects to the apparatus for sidelink communications: means for reselecting a sidelink power savings configuration to use for sidelinks between the apparatus and the plurality of UEs and the other UE; means for providing the reselected sidelink power savings configuration to the plurality of UEs and the other UE; and means for following the reselected sidelink power savings configuration for the sidelinks between the plurality of UEs and the other UE.

Aspect 30: An apparatus for wireless communication, comprising: means for receiving, from a wireless node over a sidelink, a selected sidelink power savings configuration to use for the sidelink; and means for following the selected sidelink power savings configuration for the sidelink.

Additional Considerations

The techniques described herein may be used for various wireless communication technologies, such as NR (e.g., 5G NR), 3GPP Long Term Evolution (LTE), LTE-Advanced (LTE-A), code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single-carrier frequency division multiple access (SC-FDMA), time division synchronous code division multiple access (TD-SCDMA), and other networks. The terms “network” and “system” are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network may implement a radio technology such as NR (e.g. 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS). LTE and LTE-A are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP). cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2). NR is an emerging wireless communications technology under development.

In 3GPP, the term “cell” can refer to a coverage area of a Node B (NB) and/or a NB subsystem serving this coverage area, depending on the context in which the term is used. In NR systems, the term “cell” and BS, next generation NodeB (gNB or gNodeB), access point (AP), distributed unit (DU), carrier, or transmission reception point (TRP) may be used interchangeably. A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cells. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs for users in the home, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS.

A UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE), a cellular phone, a smart phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, a smart bracelet, etc.), an entertainment device (e.g., a music device, a video device, a satellite radio, etc.), a vehicular component or sensor, a smart meter/sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium. Some UEs may be considered machine-type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, another device (e.g., remote device), or some other entity. A wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

The methods disclosed herein comprise one or more steps or actions for achieving the methods. The method steps and/or actions may be interchanged with one another. In other words, unless a specific order of steps or actions is specified, the order and/or use of specific steps and/or actions may be modified.

As used herein, a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

As used herein, the term “determining” encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Unless specifically stated otherwise, the term “some” refers to one or more. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. No claim element is to be construed under the provisions of 35 U.S.C. § 112(f) unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited using the phrase “step for.”

The various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and/or software component(s) and/or module(s), including, but not limited to a circuit, an application specific integrated circuit (ASIC), or processor. Generally, where there are operations illustrated in figures, those operations may have corresponding counterpart means-plus-function components with similar numbering.

The various illustrative logical blocks, modules and circuits described in connection with the present disclosure may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

If implemented in hardware, an example hardware configuration may comprise a processing system in a wireless node. The processing system may be implemented with a bus architecture. The bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints. The bus may link together various circuits including a processor, machine-readable media, and a bus interface. The bus interface may be used to connect a network adapter, among other things, to the processing system via the bus. The network adapter may be used to implement the signal processing functions of the PHY layer. In the case of a user terminal 120 (see FIG. 1 ), a user interface (e.g., keypad, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further. The processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.

If implemented in software, the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium. Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. The processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media. A computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. By way of example, the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface. Alternatively, or in addition, the machine-readable media, or any portion thereof, may be integrated into the processor, such as the case may be with cache and/or general register files. Examples of machine-readable storage media may include, by way of example, RAM (Random Access Memory), flash memory, ROM (Read Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof. The machine-readable media may be embodied in a computer-program product.

A software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media. The computer-readable media may comprise a number of software modules. The software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions. The software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices. By way of example, a software module may be loaded into RAM from a hard drive when a triggering event occurs. During execution of the software module, the processor may load some of the instructions into cache to increase access speed. One or more cache lines may then be loaded into a general register file for execution by the processor. When referring to the functionality of a software module below, it will be understood that such functionality is implemented by the processor when executing instructions from that software module.

Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared (IR), radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray® disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Thus, in some aspects computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media). In addition, for other aspects computer-readable media may comprise transitory computer-readable media (e.g., a signal). Combinations of the above can also be considered as examples of computer-readable media.

Thus, certain aspects may comprise a computer program product for performing the operations presented herein. For example, such a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, for example, instructions for performing the operations described herein and illustrated in FIG. 9 , FIG. 10 , and/or FIG. 11 .

Further, it should be appreciated that modules and/or other appropriate means for performing the methods and techniques described herein can be downloaded and/or otherwise obtained by a user terminal and/or base station as applicable. For example, such a device can be coupled to a server to facilitate the transfer of means for performing the methods described herein. Alternatively, various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.), such that a user terminal and/or base station can obtain the various methods upon coupling or providing the storage means to the device. Moreover, any other suitable technique for providing the methods and techniques described herein to a device can be utilized.

It is to be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims. 

The invention claimed is:
 1. A method for wireless communication by a wireless node, comprising: transmitting a first sidelink power savings configuration to a first one or more user equipment (UEs), wherein the first sidelink power savings configuration is a current power savings configuration used for a second one or more UEs; receiving from each of the first one or more UEs a proposed sidelink power savings configuration in response to the first sidelink power savings configuration; determining a second sidelink power savings configuration to use for sidelinks between the wireless node and the first one or more UEs and the second one or more UEs; providing the second sidelink power savings configuration to the first one or more UEs and the second one or more UEs; and following the second sidelink power savings configuration for communicating with the first one or more UEs and the second one or more UEs.
 2. The method of claim 1, further comprising providing an indication to one or more UEs that the wireless node does not accept input from the one or more UEs for sidelink power savings configuration selection.
 3. The method of claim 1, wherein determining the second sidelink power savings configuration comprises determining the second sidelink power savings configuration based, at least in part, on the proposed sidelink power savings configuration from the first one or more UEs.
 4. The method of claim 1, wherein the proposed sidelink power savings configuration from each of the first one or more UEs is based, at least in part, on the first sidelink power savings configuration.
 5. The method of claim 1, wherein determining the second sidelink power savings configuration comprises selecting the first sidelink power savings configuration as the second sidelink power savings configuration.
 6. The method of claim 1, wherein determining the second sidelink power savings configuration selecting a proposed sidelink power savings configuration from the first one or more UEs as the second sidelink power savings configuration.
 7. The method of claim 1, wherein determining the second sidelink power savings configuration comprises determining a different sidelink power savings configuration than the first sidelink power savings configuration and the proposed sidelink power savings configuration from each of the first one or more UEs, as the second sidelink power savings configuration, wherein the determination of the different sidelink power savings configuration is based on the first sidelink power savings configuration and the proposed sidelink power savings configuration from each of the first one or more UEs.
 8. The method of claim 1, wherein the first sidelink power savings configuration comprises a configured default sidelink power savings configuration.
 9. The method of claim 1, wherein the current power savings configuration was previously determined for communicating with the second one or more UEs.
 10. The method of claim 1, further comprising receiving sidelink information from at least one of the first one or more UEs, wherein the sidelink information comprises traffic statistics, traffic patterns, quality-of-service (QoS) targets, a subset of parameters for a sidelink power savings configuration, sidelink scheduling information for the at least one of the first one or more UEs, or a combination thereof.
 11. The method of claim 1, further comprising, when another UE connects to the wireless node for sidelink communications: redetermining a sidelink power savings configuration to use communicating with a plurality of UEs connected to the wireless node including the other UE; providing the redetermined sidelink power savings configuration to the plurality of UEs and the other UE; and following the redetermined sidelink power savings configuration for communicating with the plurality of UEs and the other UE.
 12. The method of claim 1, wherein: the wireless node receives a plurality of proposed sidelink power savings configurations from a plurality of first UEs; and determining the second sidelink power savings configuration is based on the plurality of proposed sidelink power savings configurations.
 13. The method of claim 1, wherein the second sidelink power savings configuration is a discontinuous reception (DRX) cycle configuration, the DRX cycle configuration defining one or more periods for the wireless node to monitor a physical sidelink control channel (PSCCH) for transmissions from the first one or more UEs and the second one or more UEs.
 14. A method for wireless communication by a user equipment (UE), comprising: receiving, from a wireless node over a sidelink, a first sidelink power savings configuration; transmitting a proposed sidelink power savings configuration to the wireless node in response to the first sidelink power savings configuration; receiving, from the wireless node over the sidelink, a second sidelink power savings configuration to use for the sidelink; and following the second sidelink power savings configuration for the sidelink.
 15. The method of claim 14, further comprising receiving an indication from the wireless node that the wireless node does not accept input from the UE for sidelink power savings configuration selection.
 16. The method of claim 14, wherein the second sidelink power savings configuration received from the wireless node is based, at least in part, on the proposed sidelink power savings configuration from the UE.
 17. The method of claim 14, further comprising: determining the proposed sidelink power savings configuration based at least in part on the first sidelink power savings configuration for the sidelink received from the wireless node.
 18. The method of claim 14, wherein the second sidelink power savings configuration for the sidelink received from the wireless node comprises the first sidelink power savings configuration.
 19. The method of claim 14, wherein the second sidelink power savings configuration for the sidelink received from the wireless node comprises the proposed sidelink power savings configuration.
 20. The method of claim 14, wherein the second sidelink power savings configuration for the sidelink received from the wireless node comprises a different sidelink power savings configuration, the different sidelink power savings configuration being based on the first sidelink power savings configuration and the proposed sidelink power savings configuration.
 21. The method of claim 14, further comprising transmitting sidelink information to the wireless node, wherein the sidelink information comprises traffic statistics, traffic patterns, quality-of-service (QoS) targets, a subset of parameters for a sidelink power savings configuration, sidelink scheduling information for the UE, or a combination thereof, associated with the UE.
 22. The method of claim 14, further comprising: receiving, from the wireless node over the sidelink, a reselected sidelink power savings configuration to use for the sidelink.
 23. The method of claim 14, wherein: the second sidelink power savings configuration is a discontinuous reception (DRX) cycle configuration, the DRX cycle configuration defining one or more periods for the wireless node to monitor a physical sidelink control channel (PSCCH); and following the second sidelink power savings configuration comprises transmitting PSCCH to the wireless node during the one or more periods.
 24. An apparatus for wireless communication, comprising: means for transmitting a first sidelink power savings configuration to a first one or more user equipment (UEs), wherein the first sidelink power savings configuration is a current power savings configuration used for a second one or more UEs; means for receiving from each of the first one or more UEs a proposed sidelink power savings configuration in response to the first sidelink power savings configuration; means for determining a second sidelink power savings configuration to use for sidelinks between the apparatus and the first one or more UEs and the second one or more UEs; means for providing the second sidelink power savings configuration to the first one or more UEs and the second one or more UEs; and means for following the second sidelink power savings configuration for communicating with the first one or more UEs and the second one or more UEs.
 25. The apparatus of claim 24, further comprising when another UE connects to the apparatus for sidelink communications: means for redetermining a sidelink power savings configuration to use communicating with a plurality of UEs connected to the apparatus including the other UE; means for providing the redetermined sidelink power savings configuration to the plurality of UEs and the other UE; and means for following the redetermined sidelink power savings configuration for communicating with the plurality of UEs and the other UE.
 26. An apparatus for wireless communication, comprising: means for receiving, from a wireless node, a first sidelink power savings configuration; means for transmitting a proposed sidelink power savings configuration to the wireless node over a sidelink; means for receiving, from the wireless node over the sidelink, a second sidelink power savings configuration to use for the sidelink; and means for following the second sidelink power savings configuration for the sidelink. 